[CDM][Refactoring 3/N] Consolidate association cache and disk

1. Removed pending and revoked cache lists.
2. Refactored OnAssociationChanged callbacks.
3. Replaced previouslyUserIds map with maxId.

Bug: 327049496

Test: CTS
Change-Id: I8f01caee155177f3a8b6a51e896ca4e5755b30f1
19 files changed